> It is Pentax's first, and aborted, attempt at K mount auto-focus. It only > auto-focuses with the ME-F body. Bob Blakely has/had one, and is not > hugely impressed.
It actually tested quite well in Modern Photo back when it came out (early 1980's) along with the ME-F. I think it's a decent enough fast zoom (comparable to Tokina's AT-X 35-70/2.8), but is a nuisance to use as a manual focus lens - not only is there a "useless" (for manual focus) big blob (battery box, etc.) hanging on the bottom of the lens barrel, but the focus ring is worse than on the F 50/2.8 Macro. It is (in my opinion) only worth having for a historical match for a collectible ME-F (and I do have two of 'em for that reason, one each for my chrome ME-F and my black ME-F). It's fun to use in (primitive) autofocus mode on a ME-f once in a while, but I don't think that it has much use otherwise (in my humble opinion). Fred
